Note 4 - Earnings (Loss) Per Common Share - Reconciliation of Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income attributable to Corning Incorporated		$ 563	$ 449	$ 1,144	$ 1,048
Less: Series A convertible preferred stock dividend					24
Less: Excess consideration paid for redemption of preferred shares	[1]		803		803
Net income (loss) available to common shareholders		563	(354)	1,144	221
Net income (loss) available to common shareholders – diluted		$ 563	$ (354)	$ 1,144	$ 221
Weighted-average common shares outstanding – basic (in shares)		843	844	843	805
Employee stock options and other dilutive securities (in shares)		13		14	17
Weighted-average common shares outstanding – diluted (in shares)		856	844	857	822
Basic (Note 4) (in dollars per share)		$ 0.67	$ (0.42)	$ 1.36	$ 0.27
Diluted (Note 4) (in dollars per share)		$ 0.66	$ (0.42)	$ 1.33	$ 0.27
Total (in shares)		2	33	2	63
Share-Based Payment Arrangement [Member]
Total (in shares)		2	24	2	1
Series A Convertible Preferred Stock [Member]
Series A convertible preferred stock (1) (in shares)	[2]		9		62

[1] Refer to Note 4 (Earnings (Loss) per Common Share) and Note 12 (Shareholders' Equity) to the consolidated financial statements for additional information.

[2] For the three and six months ended June 30, 2021, the Preferred Stock was anti-dilutive; therefore, it was excluded from the calculation of diluted earnings (loss) per share